The company declined to comment on whether it has made any changes to its labor practices after the 2011 factory explosion.

WSJ: Apple Shifts Supply Chain Away From Foxconn to Pegatron

But the company has faced a barrage of unfavorable publicity in recent months, including the fallout from allegations that it bribed officials in Mexico in order to smooth the way for store expansion, and criticism about its global sourcing practices after its clothing was found in a Bangladesh factory where more than 100 workers died in a fire last year.

WSJ: Wal-Mart Ad Campaign Touts 'American Success Story'

The Gap faced criticism for similar practices in 2000, when a BBC documentary uncovered young girls producing Gap products at a Cambodian factory.

CNN: Gap: Report of kids' sweatshop 'deeply disturbing'

It recently gave the workforce at Land Rover's Solihull plant an ultimatum: adopt modern, flexible working practices and give up old habits such as eating and smoking on the job, or the factory closes.

ECONOMIST: The car industry